Automatic gripping cable-pulley



(No Model.) A' l l J. H. WATTS. AUTOMATIC GRIPPING CABLE PULLEY. .NCL532,349. V Patented Jan. 8, 1895.

WMM A I WWA wlw/MB1 Wwgiesses.

NITED STATES 'PATENT rricit JOHN H. WATTS, OF AUBURN, NORTH DAKOTA.

AUTOMATIC G RI PlPlfN G` CABLE-PU LLEY.

.SPECIFICATION forming part of Letters jPatent-No. 532,349, datedVJanuary 8, 1895. Application tied nach 26.18924. serial No. 505,058.(No more.)

To aZZ whom t may concern.-

Be it known that I, JOHN H. WATTS, a subject of the Queen of GreatBritain and Ireland, who have declared my intention of becoming acitizen of the United States, residing at Aubnrn,in the county of Walsh,in the State of North Dakota: have invented certain new and usefulImprovements in Automatic Gripping Cable-Pulleys, of which the followingis a specification.

This-invention relates to automatic gripping cable pulleys, and consistsin the construction, combination, and arrangement of parts, ashereinafter shown and described, and specifically pointed out in theclaims.'

In the drawings, Figure l is a sectional side elevation, and Fig. 2 is aplain view. Fig. 3 is a detached perspective view, of one of the groovedconical gripping jaw guide drums. Fig. 4 is a detached perspective View,of one of the gripping jaw guide collars. Fig. 5 is a detachedperspective view, of the gripping jaw actuating ring. Fig. 6 is a bottomplan View showing the manner of arranging the stop ratchet.

The apparatus consists of a framework A in which a shaft B is supportedby suitable bearings A2 and to one end of which the gearing fortransmitting the power will be connected.

Keyed or otherwise connected to the shaft B are two drums B2 Ba formedslightly conical on their outer surfaces, as shown, and with a series ofgrooves et formed in their outer surfaces'and runninglengthwise of thedrums.

Between the adjacent ends of the drums B2 B4 are two collars B4 and B5,and between these two collars is a ring B6 somewhat larger than theshaft so as to be free to move loosely around the shaft between thedrums.v Surrounding the drums B2 B3 area series of gripping jaws eachformed in two portions piv- `oted together at band with outwardlycurving jaws D D2 and arms Da D4 at nearly right angles thereto andlying within the grooves a within the drums, as shown. Surrounding eachof the drums B2 B3 are rings or guide collars D5 D6 having arches orhousings e through which the arms D8 D4 project, the arms having lugs e2on their outer ends to prevent them from being drawn inward through thehousings, these collars D5 D6 thus serving as guides to the arms D3 D4,to control their action.

The inner surfaces of the hubs of the gripping jaws rest in contact withthe outer surface of the loose ring B, as shown.

The relative positions and formation of the jaws D D2 and the arms D2D2, and the drums B2 B3 are such, that when the cable d is threadedaround between the curved jaws,

ward movement of the ring B6 on the opposite side, reverses the movementof the opposite jaws and causes them to open and release their grip uponthe cable, the lugs e2 catching beneath the housings e on the rings D5D6 and holding the arms D8 D4inward in their proper proximity to thedrums, as shown in Fig. 1. By this simple arrangement, as the cablepasses around between the jaws D D2, the jaws automatically grip itfirmly on the outer side of the pulley and release it on the inner side,so that a positive tenacious pull is at all times had upon the shaft Bto revolve it. rlhere is no opportunity for slipping,and the grip ispositive and sure, no matter how heavy a load the cable may be subjectedto.

To render the action more sure, I provide the outer surface of each ofthe jaws D D2.

.supporting'the guide wheels g2 g3 will be made adjustable to compensatefor wear, or change IOO of the size of the cable; The rings D5 D6 willbe adjustable upon the drums B2 B3 to allow for larger or smallercables.

Having thus described my invention, what I claim as new is- 1. In a ropeor cable system for operating machinery, a shaft, grooved drums fastupon said shaft, pivoted jaws having arms fitting into said grooves, anda loose collar surrounding said shaft between said drums and adapted toaetuate said jaws, substantially asand for the purpose set forth.

2. In a rope or cable system for operating machinery, a shaft, grooveddrums fast upon witnesses.

JOI-IN H. WATTS. Witnesses:

A. L. MILLER, O. M. CORWIN.

